1. Senior Associate Engineer and Structural Analyst, Protection Engineering Consultants, 14144 Trautwein Rd., Austin, TX 78737.
2. Research Assistant, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, 1 University Station C1748, Austin, TX 78712.
3. Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, 1 University Station C1748, Austin, TX 78712 (corresponding author).
4. Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin, 1 University Station C1748, Austin, TX 78712.